passing data between 2 windows project in vb.net

Hi,
I need to make 3 application in vb.net .Here server , client  will be windows application and 1 application is only class library application.
What i need to do is from Client Applications i need to send data in class library application from thaere data will send to server application .I think i need to use delegates.i am new to vb.net .so i am not able to understand how i will do this.
Please help me.
Advance Thanks.